Pump and driving mechanism



July 19, 1932.

E. c. EKsTYRoMER PUMP vAND DRIVING MECHANISM Filed May 21. 195o null. l

mw' nu w 3 Sheets-Sheet 2 INVENTOR.

K i i Edward C. Eksrorner.

July 19, 1932 E. c. EKsTRoMr-:R I 1,868,098

PUMP AND DRIVING MECHANISM Filed May 2l, 1930 3 Sheets-Sheet 5 ,o l fis. zo

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la az i 32 a ORNEY Patented July 19, 1932 UNITED srA'rasy PA'TEN'I'r OFFICE EDWARD C. EKSTROMER, OF REDWOOD CITY, CALIFORNIA, ASSIGNR OF ON E-HALF T0 BERKELEY, CALIFORNIA, BLANCHE NASH GALLAGHEB,

PUMP AND DRIVING MECHAN ISM Application led May 21,

My present invention relates to oil well pumps and more ible unit of the driving means therefor, which can be lowered into a well upon the end of a discharge pipe.

An object of myinvention is to provide a new, and efficient pump unit of novel design which can be lowered into a well upon the end of a discharge pipe.

A further obiect of my invention is to provide an oil well pump of the so called short stroke type which will produce a substantially uniform iiow of oil when in operation at the bottom of a well.

Another object of my invention is to provide a new and novel driving means for my improved pump which is capable of converting a continuous rotary motion into a short stroke reciprocating motion. I

A further object of my invention is to provide an arrangement of short stroke pumps which can be operated by a single driving means to produce a substantially uniform flow of oil.

Other objects and advantages of my invention will be in part evident and in' part pointed out in the following description taken in connection with the accompanying drawings wherein I have illustrated a preferred form of my improvement. v

At the present time oil well pumps of the reciprocating type are operated by means of a motive power unit located on the surface at the top of the well. These units comprise a prime mover, a walking beam which is oscillated by means of a pitman connected to the prime mover and a sucker rod which is attached to the walking beam and caused to move with a reciprocating movement as the walking beam is oscillated. The sucker rod extends downwardly into the well where it connects to the moving parts of the pump. The use of such a sucker rod is attendant with many undesirable features, some of which are: stretching, whippin and its weight.' All of these undesirable eatures become more exaggerated as the depth of the well increases and it is therefore desirable that some means be provided whereby these diiiculties can be overcome.

particularly to a submers, short stroke type and a 1930. Serial N0. 454,300.

In order to overcome these diiliculties, I

propose to construct a prime mover element` for o eratin a reci rooatin oil well pump of'noIvel contructiolii whichgcan be lowered into the well and which the use of the above referred to motive power unit and its cooperating sucker rod. The greatest obstacle in providing such a unit is in providing a unit small enough toibe inserted into the well casing, which casing is of a relatively small diameter for such a purpose. This restriction in the size of such a unit, however, applies only to its horizontal or diametrical dimensions and since it can be made of almost anv desired length, I propose to build a multiple pump device by employing a plurality of smaller pump units which as a Whole is small enough to be inserted into the wella These smaller pump units are so disposed and connected with a common discharge conduit that when in o ration thei will produce a substantiallv umform ilow of oil to the discharge pi e.

As a driving means or my improved multiple pump unitv I propose to employ the arrangement of electric motors disclosed in my copending application, Serial Number 266,471, iiled April 2, 1928. For the purpose of this description it may be said-that the arrangement disclosed in the above application contemplates a plurality of fractional horse-power motors disposed end to end vone above the other operating in tandem and of such a diameter that they may be contained in the usual oil well casing.

Between these motor units and the pump unit, I employ a power novel design which will convert the rotary movement of the motors to a short stroke reciprocating movement which is then applied to t-he driving or sucker rods of the individual units of the multiple pump device.

For a better understanding of my invention, reference should be had to the accompanying drawings, in which I have shown by way of illustration and not of limitation apparatus which represents the best embodiment of mydevice now knownv to me. I desire to have it understood, however, that Y many changes and modifications can be made will dispense withv translating device of .V III 'and IX-IX of Fig. 4,

8,11 Fig. 2O is a diagrammatic view of the upper end of ple pump unit,

' Figs. 5 and 6 are therein without departing from the spirit of my invention.

Fig. 1 is a fragmentary verticalv sectional my improved multi- Fig. 2 is a View similar'to Fig. 1, showing theA middle portion of my pump unit,

Fig. 3 is a view similar to theabove views taken along a plane in front of the center line, as along line III-III of Fig.-6,`looking in the direction of arrows,

Fig. 4 is a fragmentary vertical sectional view taken along the centerline of the power translating means, horizontal sectional views taken respectively along lines V-V and VI-VI of Fig. 3, f

Figs. 7, 8 and 9 are similar views taken respectively along lines VII-VII, VIII- Figs. 10, 11, 12 and 13 are horizontal sectional views taken along lines X-fX, XI-d XI, XII-XII and XIII- XIII of Fig. 3,

Fig. 14 is a sectional view taken along line XIV-XIV of Fig. 3,

Figs. 15, 16, 17, 18 and 19 are horizontal sectional views taken res ectively alon lines KIT-XV, XVI-XV XVII- VII, XVIII-XVIII and XIX-XIX of Fig. 1,

developed View illustrative of the arrangement and mode of operation of the multiple pump device and driving means.

In order to fully illustrate my invention I have prepared a large number of figures in the drawings, however, it is believed that an understanding of the invention will be facilitated and the description simplified if reference to the drawings is limited to the principal figures thereof. I shall therefore in eX- plaining the apparatus limit my description to Figs. 1, 2, 3 and 4 and rely upon Fig. 20 to explain its mode of operation. Corresponding numerals will be applied to like parts in the other figures of the drawings and itis believed that with an occasional reference thereto an understanding of my invention will be complete.

In Figs. 1, 2, 3 and 4 of the drawings 10 designates an outer shellor casing of tubular A constructlon. This casing 10 extends throughpresent time,

out the total length of my apparatus and is adapted to enclose both the pump units and the motor driving means. The upper end of the shell or casing 10 is provided with a cap 11 which is threaded to connect with the lower end of a discharge pipe not shown. It will be understood that this discharge pipe is in dimension and construction similar to standard practice in the oil fields at the i. e. a pipe varying from 2 to diameter. Arranged within and extending throughout the length of the at the casing 10, I provide an inner casing 12 which l is held in spaced relation with the casing 10 so -as to provide an annular conduit 13 through which oil or any other liquid being pumped may flow. In order to provide an inlet for the oil to the conduit 13 the lower end of the outer casing 10 is provided with the usual screen button apertures 14 as shown 3 and 4. The apertures extend comin Figs. pletely to the lower end of the casing 10 which extends sufficiently far below the power translating means shown in Fig. 4, to enclose an'arrangement of motors such as is illustrated in my above referred to copending patent'application.

Disposed within the inner casing 12, I show a body member or support 15 having an axially extending central conduit 16 about which a plurality of short stroke pump units are arranged. These short stroke pump units, in this embodiment of my invention, are shown as formed by providing cylinders 17 which aredisposed in the support 15 on opposite sides ofthe central conduit 16 and in which suitable (pistons 18 having check valves 19 operate. ooperating with the pistons y18 and the valves 19, the cylinders 17 have at their inlet ends check valves 20. The pistons 18 are cored out to provide passageways 21 for the liquid being pumped and bottom of the passageways 21 the pistons are slotted as at 22 to form a cage construction or outlet passageway which cornmunicates with outlet ports 23 formed at these points inthe central conduit 16. At the upper end of the central conduit, 16 the body member 15 carries a suitable check valve J24 which serves to prevent a back flow of the liquid pumped and adjacent the inlet end is prostroke pump units are shown as arranged in one plane on opposite sides of the central conduit 16 and in the lower half ofthis body member or support the pump units are shown as similarly disposed but in a plane at right angles to that in whichthe upper units are disposed.

The above assembly is arranged to be dis-.

posed within the inner shell I12 so that the cavities 25 will register with what I shall term inlet ports 26. `These inlet ports 26 pass through the inner shell 12 and complete apassageway to the individualpump units, for the liquid pumped, through the screen buttons 14 and the annular conduit 13 formed between the outer and inner shells 10 and 12. After the pump assembly is thus placed in the inner shell 12 a collar 27 carrying a 'packing 28 is secured thereon to hold the parts in properrelation and seal the annular conduit'13. A tubular coupling 29 is then semounted to rotate ings 43 and 44 and has a downwardly exin my copending cured over the central conduit 16 to connect it with a conduit 30 formed in the cap member 11. This tubular coupling 29 also carries a packing 31 to facilitate the assembly, and maintain a liquid tight connection.

By referring now particularly to Figs. 3 and 4, it will be seen that each of the pistons 18 are provided with crossheads 32 to which parallel extending piston'rods 33 connect. e lower piston rods are shown in Fig. 4, as connected to oppositely disposed reciprotable members 34,'each of which carry a roller or cam rider 35 and the upper piston rods 33 (shown dotted in Fig. 2) are connected to similar but longer. `members 36 which carry rollers or cam riders 37. These roller carrying members 34 and 36 are each provided with downwardly tongues 38 which slide in grooves in the outer surface of a bearing housing 40. Above the bearing housing 40 and engaged by the rollers or riders 35 and a cylindrical cam member 41 projecting in which the cam effect is produced by a pair of angular- 25 1 y disposed grooves 42 extending ,completely around the cylinder. This cylinder 41 is freely upon suitable beartending shaft 45 to which any suitable motive power may be applied. In the present instance it is contemplated as previously suggested that a power unit of the type disclosed application willv beoused.

In order to provide an 'electric current supply for the e is designated by the numeral 46 and is shown as having a three wire cable 47 passing therethrough. The cable 47 extends downwardly through the collar 27 and from this point three individual conductors 48 pass through an opening 49 in the inner shell 12 and eX- tend downwardly there along to the motors. The cables 48 ar.` protected from the oil and mechanical damage by channel forming member 50 which is welded to the inner shell 12.

It is believed that with the above description and reference vto the several horizontal sectional views that ya clear understanding of the/'construction and arrangement of parts will be had. I shall therefore, now proceed with a description of the operation of the apparatus.

It will be assumed 'that connected with a suitable driving means such upon the end vof a harge pipe and that the motors have been energized. Under these conditions the cylindrical -cam member 41 will be rotating continuously in ne directin. This 39 formed 37, I provide' at mid stroke will cause the cam `riders 35 and r37' by reason of their engagement with thegrooves 42, to move up and down and impart a reciprocating movement to the piston rods 33- which movement will in turn be transmitted to the pistons 18 and thus produce a pumping action in the cylinders l17.l

By referring to Fig. 20 of the drawings, which as previously stated is a developed schematic diagram, showing the relative positions of the parts, it will be seen that there are twelve lof these ating pistons 18. These cylinders and plstons are also clearly disclosed as arranged in four groups of three cylinders each which groups I shall designate, from left to right, by the letters A, B, C and D. pon inspection of any particular group it will be seen that the arrangement of the Valves and. disposition of the cylinders 17 are such that at least one piston of each group will be operating on thepumping stroke at all times while the pumping device is in operation.

With particular reference to Fig. 2() of upwardly. Under these conditions the middle piston of group A will be pumping and the end pistons will be sucking, While in the opposite group C the middle piston will be sucking and the end pistons will be pumping.

As a result of this arrangement it will' be readily seen .that the difference in the load reduced to a minimum. What has been said with respect to groups A and C in the lowerA part of the device, is also true of groups B and D located in the upper part of the device. At the instant illustrated, the parts of the latter groups may be said to be on a dead center but at an instant later, the end pistons 18 of group B will be pumping and the middle piston will be sucking and in group D` the middle piston will be pumping and the end pistons will be sucking.

As the pistons 17 operate on their ing stroke the oil pumped will be forced through the ports 23- and. into the central the discharge pipe and out of the well. When anytwo of the groups of pistons are on their socalled dead center the other two groups of pistons Will be and as a result a substantially of oil will result. This feature is not only important with respect-to the flow of foil but is also advantageous as it imposes a substantially vuniform driving means, and as a result uniform -iiow load upon the i' cylinders 17 with cooperi losA the cam cylinder 41 is rating of the driving equipment need be of no greater power than the average power requirements.

While I have, for the sake of clearness and in order to disclose my invention so that. the same can be readily understood, described and illustrated specilic devices and arrangements, Il desire to have it understood that this invention is not limited to the specific form disclosed but may be embodied in other ways that will suggest themselves, in View of this broad disclosure, to persons skilled in the art. It is believed that this invention is broadly new and it is such so that all changes scope of the appended claims sidered as part of this invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. In a short stroke pump device the combination ofman elongated member having a central conduit extending axially therethrough and having a plurality of pump cylinders adjacent to and communicating with said conduit, a sleeve surrounding said member having ports communicating with said pump cylinders, pump pistons in said cylinders, check valves cooperating with said pistons' and cylinders, and means for imparting a reciprocating movement to said pistons.

2. A submersible pumpfor oil wells and the like comprising, an elongated support having a central discharge port extending axially therethrough, av plurality of pump units arranged axially along and concentrically about said central discharge port, a sleeve surrounding said support having inlet ports communicating with each of said pump units, and means below said pump units an within said sleeve for driving the pump units as come within the are to be conwith a reciprocating movement.

3. A short stroke pumpunit comprising, a nplurality of pump cylinders arranged in alignment in a cylindrical housing and capable of being lowered into a well, a plurality of pistons cooperating with said cylinders, driving rods Jfor said pistons extending through said housing adjacent the cylinders, a rotatable cylinder having apair of continuous cam trackways around, and means connected with said driving rods engaging said cam trackways adapted to impart a reciprocating motion. to the as said cylinder is desired to claim it as stantially as described.

conduit, pistons in said pump cylinders, means below said cam trackway for driving the latter continuously with a rotary movement, and means disposed about said central conduit connected with said pistons and engaging said cam trackways adapted to alternately impart a pumping movement to said pistons as said circular cam tated continuously in one direction.

5. short stroke pump unit comprising, a plurality of pump cylinders arranged in axial alignment in a cylindrical housing and capable of being lowered into a well, a plurality of pistons cooperating with said cylinders, driving rods for said pistons extending through said housing on opposite sides of the cylinders, a rotatable cylinder having ytwo continuous cam grooves extending there around, and means connected with said driving rods engaging said cam grooves adapted to impart a reciprocating motion to the driving rods and pistons as said cylinder is rotated about an axis extending parallel with the axis ot said pump cylinders, said last means being disposed around the cylinder housing and alternately in diierent cam grooves so that each groove necting means on oppositp sides thereof sub- 6. In a pump of the character described, the combination of a central body member having .an oil .discharge passageway extend-A ing therethroug a pair of oppositely disposed pump cylinders arranged adjacent trackway is rosaid passageway and communicating there-* with, a second pair of oppositely disposed pump cylinders arranged at another point along said central conduit and displaced at an angle from said first pair of cylinders, pistons within said cylinders,

a circular cam trackway arranged below said cylinders, and l means for engaging said cam trackway adapted to v.drive said pistons of each pair of cylinders in opposite directions, whereby as saidpistons operate a substantially ,continu-l ous flow of oil will be pumped into said discharge passagewa EDWRD C. EKSTROMER.

extending there rotated about an axis extending parallel with c,

the axis of the pump cylind 4.. Ashort stroke pump the like comprising, a member having a central conduit, a plurality of pump cylinders arranged along duit, two circular cam trackways disposed below said pump cylinders adapted to rotate about an axis extending'through said central for oil wells andl and about said central con- 

